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use zeroarray as placeholder in colorview demo #152

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use zeroarray as placeholder in colorview demo #152

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6 changes: 4 additions & 2 deletions docs/examples/spatial_transformation/image_diffview.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -28,8 +28,10 @@ plain_diffview = @. img - img_r
nothing #hide #md

# For gray images, a fancy trick is to fill each image into different RGB channels
# and make a RGB view
RGB_diffview = colorview(RGB, channelview(img), channelview(img_r), fill(0., size(img)))
# and make a RGB view. [`zeroarray`](@ref ImageCore.zeroarray) is a constant which
# serves as a placeholder to create a (virtual) all-zeros array of size that matches
# the other arguments.
RGB_diffview = colorview(RGB, channelview(img), channelview(img_r), zeroarray)
nothing #hide #md

# or convert the RGB view back to Gray image after that
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